Silver Nanoparticles in the Water Environment in Malaysia: Inspection, characterization, removal, modeling, and future perspective (original) (raw)
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This paper emphasizes on the application of the biosynthesized silver nanoparticles for removal of pollutants from wastewater. An ecofriendly and low-cost technology developed in treating the wastewater. The biosynthesized nanoparticles are impregnated on activated carbon prepared from a tamarind shell agricultural waste. The activated carbon was characterized for different parameters like, moisture content, bulk density, ash content, methylene adsorption and impregnated with biosynthesized silver nanoparticles. The impregnated activated carbon was analyzed using scanning Electron Microscope for the pore size and impregnation. The prepared material was packed in the column and used for treating the wastewater. The wastewater was analyzed for Physico-Chemical Parameters before and after treatment. After treatment of wastewater the physico-chemical parameter values reduced drastically. More than 70 % reduction was observed in pollution parameters (physico-chemical. It is concluded that, the treatment process is quite efficient and can be modified and scaled up for further to increase the efficiency of treatment process.
Effect of Silver Nanoparticles in Sewage Water Treatment
2019
The sewage water collected from different areas viz., Varaganeri and Thirupangeeli, Tiruchirappalli District were taken for the synthesis of silver nanoparticles. The characterization of synthesized AgNPs is confirmed using UV-Vis Spectroscopy. The sewage water samples were analysed the Physico-chemical parameters such as Colour, Temperature, Turbidity, pH, EC, Total solids, Total Dissolved Solids, Total Suspended Solids, Total Hardness, Calcium Hardness, Magnesium Hardness, Phosphates, Sulphates, Chlorides, Dissolved Oxygen, Free CO2, Ammonia, Nitrite, BOD and COD. The results were compared and presented. The effect of AgNPs in treating sewage water help us to apply in larger scale. IndexTerms AgNPs, Physicochemical parameter, Waste water, UV-Vis spectroscopy.
Silver Nanoparticles for Waste Water Management
Molecules
Rapidly increasing industrialisation has human needs, but the consequences have added to the environmental harm. The pollution caused by several industries, including the dye industries, generates a large volume of wastewater containing dyes and hazardous chemicals that drains industrial effluents. The growing demand for readily available water, as well as the problem of polluted organic waste in reservoirs and streams, is a critical challenge for proper and sustainable development. Remediation has resulted in the need for an appropriate alternative to clear up the implications. Nanotechnology is an efficient and effective path to improve wastewater treatment/remediation. The effective surface properties and chemical activity of nanoparticles give them a better chance to remove or degrade the dye material from wastewater treatment. AgNPs (silver nanoparticles) are an efficient nanoparticle for the treatment of dye effluent that have been explored in many studies. The antimicrobial a...
Water, Air, & Soil Pollution, 2019
Chromium (Cr(VI)) causes serious impacts on the environment and human. In this study, the commercial activated carbon-loaded silver nanoparticle (AgNPs-AC) was used as a new adsorbent to remove Cr(VI) from the aqueous solution. Batch adsorption experiments were conducted to evaluate the effects of pH, the initial concentration of Cr(VI), contact time, and dose of AgNPs-AC upon removal of Cr(VI) from the aqueous solution. The results showed that at pH of 4, the contact time of 150 min, 40 mg/L of initial Cr(VI), and dosage of 20 mg AgNPs-AC/ 25 mL were the most suitable condition for absorption of Cr(VI) onto AgNPs-AC from the aqueous solution. The maximum adsorption capacity achieved at abovementioned conditions was 27.70 mg/g. Meanwhile, the adsorption capacity of commercial activated carbon from a coconut shell obtained only 7.61 mg/g in the case where the initial Cr(VI) concentration is 10 mg/L and the contact time is 60 min. The adsorption kinetic data were found to fit best to the pseudo-second-order model with a high correlation coefficient (R 2 = 0.9597). The adsorption process was controlled by chemisorption due to the appearance of new chemical species on the adsorbent surface. The positively charged functional groups rapidly reduced Cr(VI) to Cr(III), and Cr(III) was
Water Research, 2019
The concentration of silver nanoparticles (nano-Ag) in aqueous media influences the kinetics of ion release; hence, the transformation and stability of nano-Ag are also influenced. The stability, dissolution and further transformation of nano-Ag in aqueous media at predicted environmental concentrations (PECs) mg/L may differ from that reported at higher concentrations. Analytical techniques characterizing nanoparticles (NPs) at mg/L have advantages and limitations, including an inherent bias based on theoretical and analytical considerations, as well as the matrix effects. In this work, we applied nanoparticle tracking analysis (NTA), single particle ICP-MS (sp-ICP-MS), and localized surface plasmon resonance (LSPR) analysis to study the stability and dissolution of nano-Ag with different nominal sizes (20, 40, 80 and 100 nm) at PECs in synthetic wastewater (SWW). The influence of the main wastewater constituents, such as organic matter, Cl À , S 2À , PO 4 3À and NH 4 þ , on the stability and dissolution of nano-Ag (40 nm) at PECs was also determined. Diagrams of the predominant species of silver exposed to major ligands were generated using MINTEQ. After 5 h in SWW, 20 nm nano-Ag dissolved 19.27% and 40 nm nano-Ag dissolved 14.8%. Aggregates of Ag particles were clearly noted for 80 and 100 nm nano-Ag after 5 h of exposure to SWW. Aggregates size also ranged very similar for both techniques, NTA and sp-ICP-MS, 29e211 nm and 38e241 for NTA and 48e210 and 50e220 nm, for sp-ICP-MS, respectively. Monodispersed size distribution (22e85 nm) and low dissolution (up to 5.1%) of nano-Ag at PECs were observed in presence of organic matter (5e800 mg/L) and PO 4 3À (9.5e47.5 mg/L), while precipitation and higher dissolution (up to 74.9%) were observed in media containing either Cl À (0.07e10.64 g/L), S 2À (0.32 e32.1 mg/L) or NH 4 þ (36e90 mg/L), respectively. Speciation diagrams predict the formation of Ag 2 S (s) and AgCl (s) , and soluble species such as AgCl x (xÀ1)-, AgNH 3 þ and Ag(NH 3) 2þ when Ag þ at PECs in wastewater. The NTA and sp-ICP-MS were suitable techniques for sizing nano-Ag in wastewater at PECs at experimented nominal sizes. sp-ICP-MS was also useful to quantify the coexistence of Ag þ and nano-Ag. The LSPR analysis served to determine the relative persistence of original nano-Ag at PECs in the wastewater during the first 5 h after spiking.
Chemosphere, 2012
The increasing utilization of silver nanoparticles in industrial and consumer products has raised concern to wastewater treatment utilities due to its antimicrobial activity. In this work, the removal of citrate stabilized silver nanoparticles (Ag-NPs) during the wastewater treatment processes and its impact on treatment performance were examined. During simulated primary clarification, over 90% of the Ag-NPs remained in the wastewater, indicating that the majority of silver nanoparticles in sewage would enter the subsequent treatment units. During sequencing batch reactor processes, silver nanoparticles were effectively removed in each cycle throughout the 15-d experimental duration. Continuous input of silver nanoparticles into the wastewater did not significantly alter chemical oxygen demand (COD) removal. NH 4 removal was reduced at the beginning of the SBR experiment but quickly recovered at the later stage of the experiment. This study demonstrated that in the near future it is unlikely that citrate-stabilized Ag-NPs released into sewage will cause significant adversary effects on the COD and NH 4 removal of activated sludge processes in municipal wastewater treatment plants.
Distribution of Silver (Ag) and Silver Nanoparticles (AgNPs) in Aquatic Environment
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Nanomaterials, classified as emerging pollutants that are toxic to the environment, are known to bioaccumulate across different trophic levels in the aquatic ecosystem. This study therefore investigates the distribution of silver and silver nanoparticles (AgNPs) in the aquatic environment of Skudai River, Johor, Malaysia. Water, sediment, plant, and fish samples were collected seasonally along four sites along Skudai River between May 2018 and April 2019. All samples were subjected to Ag analysis using an inductively coupled plasma mass spectrometer (ICP-MS). The analysis demonstrated that the concentration of Ag detected in water samples ranging from 0.001 to 0.505 mg/L was the lowest, whereas in the plants, 0.235 to 4.713 mg/kg of Ag was quantified. The upper sediments contained 0.036 to 28.115 mg/kg of Ag, whilst fish samples presented the highest accumulation of Ag, averaging between 9.144 and 53.784 mg/kg of Ag. Subsequently, the formation of silver nanoparticles was further pr...
2022
The emergence of industries in developing countries is a rising challenge where the generation of undesirable liquid wastes containing pollutants are discharged into water bodies without adequate treatment. This research investigated the removal of contaminant in electroplating wastewater and its toxic effect using biosynthesized silver nanoparticles. Fresh leaves of Piliostigma thonningii were used to synthesize silver nanoparticles (Ag NPs). Dynamic light scattering (DLS), transmission electron microscope (TEM) and fourier transform infrared (FTIR) were used to characterize the produced Ag NPs. The electroplating wastewater was treated using green synthesized silver nanoparticle and subjected to physicochemical analysis using standard methods. The sub-chronic toxicity studies on the blood and liver tissues were carried out. At various conditions of concentration, temperature, pH and time, TEM showed the biosynthesized SNPs (1, 2, 3, and 4) to exhibit different particle size at 50 ...
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PeerJ, 2024
Nanotechnology is an exciting area with great potential for use in biotechnology due to the far-reaching effects of nanoscale materials and their size-dependent characteristics. Silver and other metal nanoparticles have attracted a lot of attention lately because of the exceptional optical, electrical, and antimicrobial characteristics they possess. Silver nanoparticles (AgNPs) stand out due to their cost-effectiveness and abundant presence in the earth's crust, making them a compelling subject for further exploration. The vital efficacy of silver nanoparticles in addressing environmental concerns is emphasized in this thorough overview that dives into their significance in environmental remediation. Leveraging the distinctive properties of AgNPs, such as their antibacterial and catalytic characteristics, innovative solutions for efficient treatment of pollutants are being developed. The review critically examines the transformative potential of silver nanoparticles, exploring their various applications and promising achievements in enhancing environmental remediation techniques. As environmental defenders, this study advocates for intensified investigation and application of silver nanoparticles. Furthermore, this review aims to assist future investigators in developing more cost-effective and efficient innovations involving AgNPs carrying nanoprobes. These nanoprobes have the potential to detect numerous groups of contaminants simultaneously, with a low limit of detection (LOD) and reliable reproducibility. The goal is to utilize these innovations for environmental remediation purposes.